haplodiploidy
Technical term in genetics and entomology for a sex-determination system where males develop from unfertilized eggs and are haploid, while females develop from fertilized eggs and are diploid.
Sex determination in honeybees is based on haplodiploidy.
倍数性 means 'ploidy' in general, while 半倍数性 specifically refers to 'haplodiploidy'.
Compound of 半 (half), 倍数 (multiple, ploidy), and 性 (nature, property). A calque of the English 'haplodiploidy'.